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X-ray properties of z > 4 blazars
Moretti, A.; Ballo, L.; Dallacasa, D. +4 more
We present the X-ray analysis of the largest flux-limited complete sample of blazar candidates at z > 4 selected from the Cosmic Lens All Sky Survey (CLASS). After obtaining a nearly complete (24/25) X-ray coverage of the sample (from Swift-XRT, XMM-Newton, and Chandra), we analysed the spectra in order to identify the bona fide blazars. We cla…
Accounting for multiplicity in calculating eta Earth
Zink, Jon K.; Hansen, Bradley M. S.
Using the updated exoplanet population parameters of our previous study, which includes the planetary radius updates from Gaia DR2 and an inferred multiplicity distribution, we provide a revised η⊕ calculation. This is achieved by sampling planets from our derived population model and determining which planets meet our criterion for hab…
Molecular tracers of radiative feedback in Orion (OMC-1). Widespread CH+ (J = 1-0), CO (10-9), HCN (6-5), and HCO+ (6-5) emission
Cernicharo, José; Bron, Emeric; Goicoechea, Javier R. +4 more
Young massive stars regulate the physical conditions, ionization, and fate of their natal molecular cloud and surroundings. It is important to find tracers that quantify the stellar feedback processes that take place on different spatial scales. We present 85 arcmin2 velocity-resolved maps of several submillimeter molecular lines, taken…
Exomoons in the Habitable Zones of M Dwarfs
Piro, Anthony L.; Barnes, Rory; Martínez-Rodríguez, Héctor +2 more
M dwarfs host most of the exoplanets in the local Milky Way. Some of these planets, ranging from sub-Earths to super-Jupiters, orbit in their stars’ habitable zones (HZs), although many likely possess surface environments that preclude habitability. Moreover, exomoons around these planets could harbor life for long timescales and thus may also be …
The stellar initial mass function of the solar neighbourhood revealed by Gaia
Sollima, A.
I use a sample of more than 120 000 stars in the solar neighbourhood, with parallaxes, magnitudes and colours estimated with unprecedented accuracy by the second data release of the Gaia mission, to derive the initial mass function of the Galactic disc. A full-forward technique is used to take into account, for the population of unresolved binarie…
HD 219666 b: a hot-Neptune from TESS Sector 1
Alonso, R.; Bouchy, F.; Deeg, H. +73 more
We report on the confirmation and mass determination of a transiting planet orbiting the old and inactive G7 dwarf star HD 219666 (M⋆ = 0.92 ± 0.03 M⊙, R⋆ = 1.03 ± 0.03 R⊙, τ⋆ = 10 ± 2 Gyr). With a mass of Mb = 16.6 ± 1.3 M⊕, a radius of Rb = 4.71 ± 0.17 R…
A Method to Search for Black Hole Candidates with Giant Companions by LAMOST
Liu, Jifeng; Bai, Yu; Gu, Wei-Min +10 more
We propose a method to search for stellar-mass black hole (BH) candidates with giant companions from spectroscopic observations. Based on the stellar spectra of Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) Data Release 6, we obtain a sample of seven giants in binaries with large radial velocity variation ΔV R >…
Black hole mass estimates in quasars. A comparative analysis of high- and low-ionization lines
Bon, E.; Marziani, P.; Bon, N. +7 more
Context. The inter-line comparison between high- and low-ionization emission lines has yielded a wealth of information on the structure and dynamics of the quasar broad line region (BLR), including perhaps the earliest unambiguous evidence in favor of a disk + wind structure in radio-quiet quasars.
Aims: We carried out an analysis of the C IV…
A recurrent nova super-remnant in the Andromeda galaxy
Ness, J. -U.; Henze, M.; Shafter, A. W. +15 more
The accretion of hydrogen onto a white dwarf star ignites a classical nova eruption1,2—a thermonuclear runaway in the accumulated envelope of gas, leading to luminosities up to a million times that of the Sun and a high-velocity mass ejection that produces a remnant shell (mainly consisting of insterstellar medium). Close to the upper m…
Expected intermediate-mass black holes in the Virgo cluster - II. Late-type galaxies
Soria, Roberto; Graham, Alister W.; Davis, Benjamin L.
The Chandra X-ray Observatory's Cycle 18 Large Program titled `Spiral galaxies of the Virgo Cluster' will image 52 galaxies with the ACIS-S detector. Combined with archival data for an additional 22 galaxies, this will represent the complete sample of 74 spiral galaxies in the Virgo cluster with star formation rates ≳0.3 M⊙ yr-1